Preliminary X-ray crystallographic analysis of a Ca2+-binding protein human S100A1

S100A1, a Ca2+-binding protein from the S100 protein family, has been cryst allized by the vapour-diffusion method using polyethylene glycol 4000 as th e precipitant at pH 8.5. The crystal belongs to space group P6(3). The unit -cell parameters are a = b = 57.3, c = 104.7 Angstrom. There appear to be t wo S100A1 molecules in the asymmetric unit. The crystals were stable during exposure to X-rays and diffract to 2.6 Angstrom resolution in-house.